122 lines
2.3 KiB
Go
122 lines
2.3 KiB
Go
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package blogo
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import (
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"errors"
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"io"
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"io/fs"
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"log/slog"
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"net/http"
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)
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type Options struct {
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Logger *slog.Logger
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}
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type Blogo struct {
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files fs.FS
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sources []SourcerPlugin
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log *slog.Logger
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panic bool
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}
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func New(opts ...Options) *Blogo {
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opt := Options{}
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if len(opts) > 0 {
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opt = opts[0]
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}
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if opt.Logger == nil {
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opt.Logger = slog.New(slog.NewTextHandler(io.Discard, &slog.HandlerOptions{}))
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} else {
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opt.Logger = opt.Logger.WithGroup("blogo")
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}
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return &Blogo{
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files: nil,
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sources: []SourcerPlugin{},
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log: opt.Logger,
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panic: true, // TODO
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}
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}
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func (b *Blogo) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if b.files == nil {
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err := b.Init()
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if err != nil {
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err = errors.Join(errors.New("failed to initialize Blogo engine on first request"), err)
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if b.panic {
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panic(err.Error())
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} else {
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w.WriteHeader(http.StatusInternalServerError)
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_, _ = w.Write([]byte(err.Error()))
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}
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return
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}
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}
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f, err := b.files.Open(r.URL.Path)
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if errors.Is(err, fs.ErrNotExist) {
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w.WriteHeader(http.StatusNotFound)
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_, _ = w.Write([]byte(err.Error()))
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return
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} else if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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_, _ = w.Write([]byte(err.Error()))
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return
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}
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defer f.Close()
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buf := make([]byte, 1024)
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for {
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n, err := f.Read(buf)
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if err != nil && err != io.EOF {
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w.WriteHeader(http.StatusInternalServerError)
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_, _ = w.Write([]byte(err.Error()))
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}
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if n == 0 {
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break
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}
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_, err = w.Write(buf[:n])
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if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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_, _ = w.Write([]byte(err.Error()))
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}
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}
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}
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func (b *Blogo) Use(p Plugin) {
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if p, ok := p.(SourcerPlugin); ok {
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b.log.Debug("Added sourcer plugin", slog.String("plugin", p.Name()))
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b.sources = append(b.sources, p)
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}
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}
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func (b *Blogo) Init() error {
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b.log.Debug("Initializing blogo")
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fs, err := b.sourceFiles()
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if err != nil {
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return errors.Join(errors.New("failed to source files"), err)
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}
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b.files = fs
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return nil
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}
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type emptyFS struct{}
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func (f emptyFS) Open(name string) (fs.File, error) {
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return nil, fs.ErrNotExist
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}
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func (b *Blogo) sourceFiles() (fs.FS, error) {
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if len(b.sources) == 0 {
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return emptyFS{}, nil
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}
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return b.sources[0].Source() // TODO: Support for multiple sources (with or without preffixes, first-read, etc etc)
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}
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